Composition for forming calcium phosphate type setting material and process for producing setting material

Abstract

A composition for forming a calcium phosphate type setting material comprising (1) powder comprising at least one of (alpha)-tricalcium phosphate and tetracalcium phosphate; and (2) a setting solution comprising an aqueous acidic solution having dissolved therein at least one polysaccharide selected from the group consisting of carboxymethyl chitin, glycol chitin, pullulan, high methoxy-pectin and chitosan in such an amount that the setting solution has a viscosity of 70 cp or more, and a process for producing a calcium phosphate type setting material using such a composition.

What is claimed is: 
     
       1. A process for producing a calcium phosphate comprising the step of calcining, at a temperature of from about 1,150° C. to 1,450° C. under a pressure of about 10 pa or less, a calcium phosphate having a molar ratio of Ca/P of about 1.8 or less and more than 1.5 so as to produce a mixture consisting essentially of α-tricalcium phosphate and tetracalcium phosphate. 
     
     
       2. The process of claim 1, wherein said pressure is about 10 -2  Pa or less.